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HP 95LX - Page 129

HP 95LX
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The
RAM
Requirements
of
Running
DOS
Programs
Note
that
there
are
three
ways
to
run
a
DOS
program:
from
the
Filer;
from
the
DOS
prompt
after
boot-up;
and
from
the
DOS
prompt
reached
via
the
Filer.
The
method
you
choose
affects
the
amount
of
system
RAM
available
to
your
program,
because
each
method
uses
a
different
amount
of
system
RAM
for
overhead:
¢
Boot
up
to
DOS,
then
run
the
program:
18kB.
*
Run
the
program
from
the
Filer:
96kB.
*
Move
to
the
DOS
prompt
from
the
Filer,
then
run
the
program:
98kB.
Using
Plug-In
RAM
Cards
The
HP
95LX
can
use
any
plug-in
RAM
cards—up
to
2MB
in
capacity—that
conform
to
the
PCMCIA
1.0
and
JEIDA
4.0
standards.
There
are
several
suppliers
who
are
selling
cards
compatible
with
these
standards,
including
HP
itself
(128kB
and
512kB
cards
are
available
as
of
this
writing).
The
HP
cards are
specially
designed
for
low-power
consumption;
most
of
the
others
are
not.
In
fact,
some
are
downright
power
hogs.
The
batteries
for
the
HP
cards
should
last
around
a
year;
other
cards
have
been
wearing
out
their
batteries
in
a
few
weeks.
Caveat
emptor!
Anytime
you
insert
a
plug-in
card
into
the
A?
drive,
the
System
Manager
auto-
matically
looks
for
an
&%
“apname
.
1st
file
in
that
disk’s
root
directory
and
attaches
(to
hotkeys)
any
unattached
«
EXM
applications
listed
there.
So
if
you
have
System
Manager-compliant
applications
stored
on
a
plug-in
RAM
disk—and
nowhere
else—be
sure
to
include
the
apname
.
1st.
file
in
the
root
directory
of
the
plug-in
disk.
With
a
plug-in
card
inserted
(in
the
A?
drive)
at
system
reset
(warm
restart),
DOS
boots
up
the
A®
disk
(the
plug-in
card)
first,
looking
for
a
CONF
IG
.SYS
file.
Ifit
finds
one,
it
will
use
it—instead
of
the
CONF
IG
.
SYS
file
on
the
built-in
C#
disk—to
choose
one
of
the
control
programs.*
*Thus,
if
you
put
a
CONF
19
«SYS
file—with
the
shel
1=command
.com
~p
statement
in
it—only
on
the
A%
disk,
when
you
reset
the
system
with
the
card
inserted,
it
will
start-up
at
the
DOS
prompt.
Ifyou
reset
the
system
without
the
card
inserted,
then
it
will
start-up
in
the
System
Manager.
This
can
be
a
handy
way
to
switch
between
operating
systems,
when
you
want
to
run
larger
DOS-based
programs.
See
chapter
6
for
more
discussion
on
these
topics.
All
About
RAM
129

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